MC74LCX245DWR2G

Overview

The MC74LCX245DWR2G is a low-voltage CMOS octal bidirectional transceiver from the 74LCX series, manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 3.6 V and features 5 V-tolerant inputs and outputs, enabling safe interfacing with 5 V logic devices even when powered at lower voltages. The device provides non-inverting data transmission with a propagation delay of 8 ns and supports balanced output currents of 24 mA for both sourcing and sinking. Packaged in a 20-SOIC surface-mount format, it includes an Output Enable pin to force ports into a high-impedance state and a Transmit/Receive control input to direct data flow.

Feature Summary

• Provides 5 V tolerant I/O capability, allowing direct interface between 2.0–3.6 V logic systems and 5 V TTL or LVTTL components without level shifting.
• Features IOFF circuitry that guarantees high-impedance states on all ports when the supply voltage is removed, supporting live insertion and withdrawal applications.
• Delivers strong 24 mA balanced sink and source current drive capability at both A and B ports to ensure signal integrity across bus-oriented applications.

Applications

• Memory address and data bus driving in portable electronic devices
• Clock distribution and buffering in low-voltage digital systems
• Bidirectional data translation between different voltage domains

Procurement Notes

Verify the specific suffix DWR2G against the manufacturer's latest datasheet to confirm package type (SOIC-20) and tape-and-reel quantity. Confirm RoHS compliance status and check for any automotive qualification prefixes if required for your application environment. Ensure the operating temperature range meets your system specifications before finalizing procurement.

Selection Notes

Select this component when interfacing 3.3 V or 2.5 V logic with 5 V peripherals requires 5 V tolerance. The 24 mA drive strength suits moderate capacitive loads. Compare against MC74AC245 for higher speed or MC74LVX245 for slightly different electrical characteristics. Verify that the 8 ns propagation delay aligns with your timing constraints.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices, designed for high-speed operation with low power consumption. It serves as a standard solution for bidirectional data transfer in modern embedded systems where mixed-voltage interfaces are common. The SOIC-20 package allows for compact PCB layout in space-constrained designs.

Replacement Considerations

MC74LCX245DTR2G: Same functional specification with TR (Tape & Reel) packaging instead of CT (Cut Tape). MC74LCX245WM: Similar LCX245 function but in a wider SOIC-20W package; verify pin compatibility and thermal requirements.